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Add implementation of SE-0185 to CHANGELOG #12447

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Oct 16, 2017
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Add implementation of SE-0185 to CHANGELOG #12447

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36 changes: 36 additions & 0 deletions CHANGELOG.md
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Expand Up @@ -6,6 +6,7 @@ CHANGELOG

| Contents |
| :--------------------- |
| [Swift 4.1](#swift-41) |
| [Swift 4.0](#swift-40) |
| [Swift 3.1](#swift-31) |
| [Swift 3.0](#swift-30) |
Expand All @@ -18,6 +19,41 @@ CHANGELOG

</details>

Swift 4.1
---------

* [SE-0185][]
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I think you need to add the link to the actual proposal elsewhere in the file for this to work

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Much to my surprise, it was already there! (Last line of https://raw.githubusercontent.com/apple/swift/master/CHANGELOG.md.)


Structs and enums that declare a conformance to `Equatable`/`Hashable` now get an automatically synthesized implementation of `==`/`hashValue`. For structs, all stored properties must be `Equatable`/`Hashable`. For enums, all enum cases with associated values must be `Equatable`/`Hashable`.

```swift
public struct Point: Hashable {
public let x: Int
public let y: Int

public init(x: Int, y: Int) {
self.x = x
self.y = y
}
}

Point(3, 0) == Point(0, 3) // false
Point(3, 0) == Point(3, 0) // true
Point(3, 0).hashValue // -2942920663782199421

public enum Token: Hashable {
case comma
case identifier(String)
case number(Int)
}

Token.identifier("x") == .number(5) // false
Token.identifier("x") == .identifier("x") // true
Token.number(50).hashValue // -2002318238093721609
```

If you wish to provide your own implementation of `==`/`hashValue`, you still can; a custom implementation will replace the one synthesized by the compiler.

Swift 4.0
---------

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